TEST - 18 (Human eye and Colourful world)

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EFFORTS NEVER FAIL

NAME : *

1. A camera employs a........lens to form ........images. *

1 point

Divergent, real

Convergent, real

Divergent, virtual

Convergent, virtual

2. The sky looks blue and clear on sunny day because *

1 point

Dispersion of light

scattering of light

Reflection light

refraction of light

3. The angle of minimum deviation for an equilateral triangle prism is found to be 30 degrees. Its refractive index is *

1 point

root 2

1/2

1/ root 2

4.The power of accommodation of normal eye is *

1 point

4 D

40 D

44 D

400 D

5. Which part of retina identify the colour? *

1 point

Rods

Cones

A and B

None of the above

6. Natural example of dispersion of light is? *

1 point

Scattering

Blue colour of sky

Rainbow

none of these

7. The size of an object as perceived by an eye depends primarily on *

1 point

actual size of the object

Distance of the object from the eye

Aperture of the pupil

size of the image formed on the retina

8. When objects at different distances are seen by the eye which of the following remainconstant? *

1 point

Focal length of eye-lens

Object distance from eye-lens

The radii of curvature of eye-lens

Image distance from eye-lens

9. The maximum and minimum focal lengths of eye lens are *

1 point

24 cm / 22.7 cm

2.5 cm / 2.27 cm

25 mm/22.7 mm

B and C

10. During refraction will not change? *

1 point

Wave length

frequency

speed of light

all the above

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